[Bug]: Show sidebar button removal not persistent.

[thoth-amon]

Pre-Submission Checklist

• [X] I have checked the existing/closed issues to ensure this issue has not already been reported.
• [X] I am using the latest supported version of the browser.
• [X] I have tried disabling all browser extensions/add-ons to rule out interference from these.
• [ ] I have tried clearing the browser cache and cookies.
• [X] I have checked with a new profile and the issue still occurs.
• [X] I have provided detailed step-by-step instructions on how to reproduce the issue.
• [X] I have included relevant screenshots or console outputs.
• [ ] I have checked this problem is not occurring in the latest version of Firefox ESR.
• [X] This issue is specific to this browser and does not occur in other browsers.

Bug Summary

Show sidebars button reappears in the same place every browser restart despite being removed,

Reproduction Steps

1. Open Browser
2. Remove "show sidebars" button which is next to the back button.
3. Close and Restart Browser.

Expected Behavior

Removing the show sidebars button is persistent.

Actual Behavior

Removing the show sidebars button is not persistent.

Screenshots

Browser Version

11.14.1

Operating System

OpenSuse Tumbleweed.

Additional Context

No response

[guigirl42]

I can confirm this new bug, which only arose with v11.14.0, & persists with 11.14.1.

Removing the icon does not help, pinning it to the Overflow Menu does not help, moving it to the Bookmark Bar does not help. In all cases, after some period of time [measured in minutes or hours, not days], the Show sidebars icon returns to the lefthand end of the url bar.

There is a second symptom of this new bug. Each time this unwelcome icon returns, the Profile Manager button stops obeying left-clicks, & thus cannot be used any more to open the dropdown menu & launch another profile.

[thoth-amon]

I managed to do a workaround by opening the "prefs.js" file, located in the profile folder, in a text editor (make sure there are no instances of floorp open). I went to line 73, which shows a list of buttons. I deleted \"sidebar-button\", and saved the file. The change is persisting for now.